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Fig. 1.

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Comparison between two choices of Green’s function used in helioseismic holography, as functions of the angular distance Δ between the source and the receiver (both on the solar surface) and time. In both cases, the frequency bandwidth is 2.5–4.5 mHz. Left panel: second-skip Green’s function based on the formalism of Lindsey & Braun (2000a; corrected ray theory) and used by the JSOC/Stanford far-side imaging pipeline. Distances from 115° to 172° are used to map the far side within 50° of the antipode to disk center. Right panel: Green’s function obtained by solving the scalar wave equation in the frequency domain (Eq. (8)). The solution is restricted to harmonic degrees in the range 5–45.

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